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    <title>银行系统</title>
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    <h1>Python Bank</h1>
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    <a type="button" class="btn btn-outline-primary" href="/signup">注册</a>
    <a type="button" class="btn btn-outline-secondary" href="/query">查询</a>
    <a type="button" class="btn btn-outline-success" href="/transfor">转账</a>
    <a type="button" class="btn btn-outline-warning" href="/deposit">存款</a>
    <a type="button" class="btn btn-outline-info" href="/changepwd">改密</a>
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    <div class="jumbotron">
        <h1 class="display-4">Hello, Mr.Xu!</h1>
        <p class="lead">I am doing Python Course Experimental Report 4</p>
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        <p>This site is built by AnonyEast</p>
        <a class="btn btn-primary btn-lg" href="#" role="button">本站使用Bootstarp4</a>
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